1649337901 has 2 divisors, whose sum is σ = 1649337902. Its totient is φ = 1649337900.

The previous prime is 1649337847. The next prime is 1649337929. The reversal of 1649337901 is 1097339461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1264158025 + 385179876 = 35555^2 + 19626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1649337901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649337941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824668950 + 824668951.

It is an arithmetic number, because the mean of its divisors is an integer number (824668951).

Almost surely, 2^1649337901 is an apocalyptic number.

It is an amenable number.

1649337901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649337901 is an equidigital number, since it uses as much as digits as its factorization.

1649337901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 1649337901 is about 40612.0413301277. The cubic root of 1649337901 is about 1181.5076728141.

The spelling of 1649337901 in words is "one billion, six hundred forty-nine million, three hundred thirty-seven thousand, nine hundred one".